Probing the Properties of the Pulsar Wind in the Gamma-Ray Binary HESS J0632+057 with NuSTAR and VERITAS Observations
- Archer, A.
- Benbow, W.
- Feng, Q.
- Finley, J. P.
- Fortson, L.
- Furniss, A.
- Gent, A.
- Gillanders, G. H.
- Giuri, C.
- Gueta, O.
- Hanna, D.
- Hassan, T.
- Bird, R.
- Hervet, O.
- Holder, J.
- Hughes, G.
- Humensky, T. B.
- Kaaret, P.
- Kelley-Hoskins, N.
- Kertzman, M.
- Kieda, D.
- Krause, M.
- Lang, M. J.
- Brill, A.
- Maier, G.
- Moriarty, P.
- Mukherjee, R.
- Nieto, D.
- Nievas-Rosillo, M.
- O’Brien, S.
- Ong, R. A.
- Otte, A. N.
- Park, N.
- Petrashyk, A.
- Brose, R.
- Pfrang, K.
- Pohl, M.
- Prado, R. R.
- Pueschel, E.
- Quinn, J.
- Ragan, K.
- Reynolds, P. T.
- Ribeiro, D.
- Richards, G. T.
- Roache, E.
- Buchovecky, M.
- Sadeh, I.
- Santander, M.
- Schlenstedt, S.
- Sembroski, G. H.
- Sushch, I.
- Weinstein, A.
- Wilcox, P.
- Wilhelm, A.
- Williams, D. A.
- Williamson, T. J
- Christiansen, J. L.
- Hailey, C. J.
- Mandel, S.
- Mori, K.
- Chromey, A. J.
- Cui, W.
- Falcone, A.
DOIAbstract
HESS J0632+057 is a gamma-ray binary composed of a compact object orbiting a Be star with a period of about 315 days. Extensive X-ray and TeV gamma-ray observations have revealed a peculiar light curve containing two peaks, separated by a dip. We present the results of simultaneous observations in hard X-rays with NuSTAR and in TeV gamma-rays with VERITAS, performed in 2017 November and December. These observations correspond to the orbital phases phgr ≈ 0.22 and 0.3, where the fluxes are rising toward the first light-curve peak. A significant variation of the spectral index from 1.77 ± 0.05 to 1.56 ± 0.05 is observed in the X-ray data. The multiwavelength spectral energy distributions (SED) derived from the observations are interpreted in ...
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